EP0560186B1 - Pilot circuit of an electric motor, of the type used for producing the rotation of a drum of a laundry washing machine - Google Patents

Pilot circuit of an electric motor, of the type used for producing the rotation of a drum of a laundry washing machine Download PDF

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Publication number
EP0560186B1
EP0560186B1 EP93103356A EP93103356A EP0560186B1 EP 0560186 B1 EP0560186 B1 EP 0560186B1 EP 93103356 A EP93103356 A EP 93103356A EP 93103356 A EP93103356 A EP 93103356A EP 0560186 B1 EP0560186 B1 EP 0560186B1
Authority
EP
European Patent Office
Prior art keywords
controlled switch
circuit
electric motor
controlled
motor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP93103356A
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German (de)
English (en)
French (fr)
Other versions
EP0560186A3 (enrdf_load_stackoverflow
EP0560186A2 (en
Inventor
Francescopaolo Mandara
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bitron SpA
Original Assignee
Bitron SpA
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Filing date
Publication date
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Publication of EP0560186A2 publication Critical patent/EP0560186A2/en
Publication of EP0560186A3 publication Critical patent/EP0560186A3/xx
Application granted granted Critical
Publication of EP0560186B1 publication Critical patent/EP0560186B1/en
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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
    • H02P25/10—Commutator motors, e.g. repulsion motors
    • H02P25/14—Universal motors
    • H02P25/145—Universal motors whereby the speed is regulated by measuring the motor speed and comparing it with a given physical value, speed feedback

Definitions

  • the present invention refers to a control circuit of a load, in particular of an electric motor for producing the rotation of a drum of a laundry washing machine, comprising an electronic circuit that detects the rotation speed of the motor and that controls a first controlled switch, through which the rotation speed of the motor is regulated, varying the time periods during which an electric supply is supplied to the motor.
  • a laundry washing machine has a rotary basket, wherein the laundry is placed, which is actuated by an electric motor through a pulley and a belt.
  • the rotation speed of the basket is necessarily variable and varies from a dozen or so revolutions a minute during the washing phases, up to a thousand revolutions a minute during the spinning and drying phase. Also during the spinning phase it is normal use to vary the rotation speed of the basket through external manual settings.
  • motors are used that have a wide speed range within which they can be used.
  • linear motors which can be energised both in direct current and in alternating current. They have a typical structure of a direct current motor with excitation in series.
  • phase angle control The variation of the speed of the motor is obtained through a so-called phase angle control.
  • a controlled switch is connected in series to the electric motor, for example a triac, which is closed during a determined part of each period of mains supply voltage.
  • the variation of the closure time of the controlled switch produces a variation in the current supplied by the mains supply to the motor and as a result determines the variation of the rotation speed of the electric motor of the laundry washing machine.
  • the closure time of said controlled switch is determined by an appropriate electronic circuit, which, through its output terminal, provides the necessary information for determining the speed of the electric motor and, as a result, of the drum according to the washing phases in which the laundry washing machine is to be found.
  • a problem that can occur in laundry washing machines of the type described above is a great increase of the rotation speed of the drum due to a short circuit of the controlled switch. Such a case could cause serious damages both to the structure of the laundry washing machine, and to the user; in fact as shortcircuiting is an unpredictable event, it could occur when the drum, besides containing clothes to be washed, is full of water.
  • the displacement of such a consistent mass due to the very-high speed of which the drum is rotated by the motor would cause serious damage to the mechanical structure of the machine, which would not be able to tolerate such stress.
  • a further problem that could arise, in laundry washing machines of the tumble dryer type, is constituted by the eventuality that a possible short circuit of the controlled switch occur during the drying phase of the laundry. During such phase it is possible to open the hatch of the machine for allowing the user to verify whether the laundry contained in the drum is sufficiently dry. Obviously during the aforementioned functional phase of the laundry washing machine the rotation speed of the drum, and as a result the rotation speed of the electric motor, is very low. The great increase of the rotation speed of the drum that is verified due to a short circuit of the ends of the controlled switch could, as a result, cause serious accidents to the user if, in the actual moment in which the short circuit is verified, he happens to have an arm inside the drum for ascertaining the dryness of the laundry.
  • Such relay being commanded by a detection circuit of short circuits of the controlled switch, is actuated to open its contacts, therefore removing supply from the electric motor, each time that at the ends of the controlled switch, normally a triac, a shortcircuit is verified detected for example by an abnormal increase in the rotation speed of the motor.
  • a relay in a control circuit such as that described above does have drawbacks such as size, weight and costs for reasons of sizing, in fact it has to be sized so as to substantially allow the passing of the current that feeds the electric motor.
  • the safety system of the control circuit only intervenes in the case in which a malfunction has already been verified, i.e. does not prevent the conditions of malfunctioning of the machine from occuring.
  • the above provided systems moreover intervene with a delay if compared to the occurance of the anomalous functioning of the circuit. Such delay can also cause the safety circuit to be able to intervene only after that damages to the laundry washing machine have already been verified.
  • the preamble of claim 1 is based on EP-A-349923 which discloses a control circuit of an electric motor comprising two controlled switches connected in series and driven by means of respective transformer coupling; each of the switches being, further, insulated from the control circuit.
  • This the aim of the present invention is that of obtaining a control circuit that does not have the drawbacks described above and at the same time results in being simple, reliable and of low cost.
  • the present invention has as its subject a control circuit for an electric motor for producing the rotation of a drum of a laundry washing machine according to claim 1.
  • the resistors R10 and R32 are respectively connected.
  • the first end of a resistor R23 and the point in common of two controlled switchs TR1 and TR2 of the triac type are connected.
  • an electric motor M1 of the universal type is arranged in series to said triac TR1 and TR2.
  • Such motor M1 is constituted by the connection in series of a stator coil S and of a rotor coil R.
  • Such motor M1 is supplied by way of an alternating current voltage supplied to the ends of two terminals of the circuit, shown respectively with F (phase) and with N (neutral).
  • the stator coil S that generates an excitation field receives voltage through a double shunter D, that has the function of producing the inversion of the rotation sense of the rotor R.
  • the current running in the motor is regulated based on the opening and dosure time of the two triac TR1 and TR2, mounted in series on the path between a head of the motor M1 and the circuital terminal N.
  • the two triac TR1 and TR2 are controled by said integrated circuit U1.
  • the two triac TR1 and TR2 are connected in a back to back configuration i.e. with a terminal, indicated with MT2, of the first controlled switch TR1 connected to the terminal, also indicated with MT2, of the second controlled switch TR2.
  • the latter being commanded by a third controlled switch, indicated with TR3, which receives, through a resistor R31, the control signal simultaneously with the first controlled switch TR1 from pin 13 of said specific integrated circuit U1 through the resistor R32.
  • the terminal MT1 of the triac TR1 is connected, through a shunt resistor SH1 to the terminal N of the circuit.
  • the two resistors R10 and R23 connected in series supply the integrated circuit U1, through the terminal 1, with a current synchronization impulse.
  • the integrated circuit U1 through its pin 13 provides the specified control timing of the motor M1.
  • the current divider constituted by resistors R30 and R31 a first part of the control signal goes directly to the triac TR1 which opens and closes for supplying the electric current necessary for making the electric motor M1 rotate in accordance with the requirements of the washing cycle in which the laundry washing machine is to be found;
  • a second part of the control signal goes to the triac TR3 which in turn commands the second triac TR2 in order to open and close accordingly to the opening and closure operations of the triac first TR1.
  • a triac as a third controlled switch TR3 allows to pass the control current from phase terminal F to the neutral terminal N and viceversa, in any phase of the half-wave supply period .
  • the second positive consequence is understandable by analysing the functioning of the control circuit of an electric motor in the case in which a short circuit of the triac TR1 is verified. In the presence of such an event it will occur that the point in common of the two triac TR1 and TR2, will be brought to a very low voltage value (practically to the neutral value) so as that the current synchronization information to the pin 1 of the integrated circuit U1 will no longer arrive. In this functional condition said integrated circuit U1 will stop generating control impulses, so as that the triac TR2 will stop conducting and the motor M1, if it was in motion, will stop.
  • control circuit will function as a normal control circuit of a motor for rotating a drum of a laundry washing machine utilising a single triac.
  • control circuit of an electric motor in particular of a motor for the rotation of a drum of a laundry washing machine, are clear from the given description and annexed drawing.
  • control circuit has a lower cost, a longer duration, a greater functional safety, a high reliability and the applicational simplicity, and also the possibility to automatically restore the motor operation in certain functional cases, when the short circuit is not permanent or when is opportunely removed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Control Of Ac Motors In General (AREA)
EP93103356A 1992-03-09 1993-03-03 Pilot circuit of an electric motor, of the type used for producing the rotation of a drum of a laundry washing machine Expired - Lifetime EP0560186B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO920194A IT1256545B (it) 1992-03-09 1992-03-09 Circuito di pilotaggio di un motore elettrico, del tipo di quelli usati per produrre la rotazione di un cestello di una macchina lavabiancheria
ITTO920194 1992-03-09

Publications (3)

Publication Number Publication Date
EP0560186A2 EP0560186A2 (en) 1993-09-15
EP0560186A3 EP0560186A3 (enrdf_load_stackoverflow) 1994-03-16
EP0560186B1 true EP0560186B1 (en) 1997-05-28

Family

ID=11410178

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93103356A Expired - Lifetime EP0560186B1 (en) 1992-03-09 1993-03-03 Pilot circuit of an electric motor, of the type used for producing the rotation of a drum of a laundry washing machine

Country Status (4)

Country Link
EP (1) EP0560186B1 (enrdf_load_stackoverflow)
DE (1) DE69310960T2 (enrdf_load_stackoverflow)
ES (1) ES2102542T3 (enrdf_load_stackoverflow)
IT (1) IT1256545B (enrdf_load_stackoverflow)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NZ264306A (en) * 1993-11-16 1998-06-26 Gold Star Co Washing machine motor speed controller
DE102004018966B4 (de) * 2004-04-13 2015-02-19 C. & E. Fein Gmbh Reihenschlussmotor
CN102024306B (zh) * 2010-10-29 2016-04-27 海尔集团公司 一种洗衣机门盖检测电路

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2125642B (en) * 1982-08-06 1985-10-02 Philips Electronic Associated Washing machine motor speed control circuit
ES2047063T3 (es) * 1988-07-07 1994-02-16 Zanussi A Spa Industrie Medios de control para un motor electrico universal.

Also Published As

Publication number Publication date
EP0560186A3 (enrdf_load_stackoverflow) 1994-03-16
IT1256545B (it) 1995-12-07
ES2102542T3 (es) 1997-08-01
DE69310960T2 (de) 1997-11-27
ITTO920194A0 (it) 1992-03-09
ITTO920194A1 (it) 1993-09-09
EP0560186A2 (en) 1993-09-15
DE69310960D1 (de) 1997-07-03

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